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Add 'users/glittershark/xanthous/' from commit '53b56744f4'

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git-subtree-dir: users/glittershark/xanthous
git-subtree-mainline: 91f53f02d8
git-subtree-split: 53b56744f4
This commit is contained in:
Vincent Ambo 2020-06-16 01:05:44 +01:00
commit 2edb963b97
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users/glittershark/xanthous/src/Xanthous/Util/JSON.hs Normal file
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--------------------------------------------------------------------------------
module Xanthous.Util.JSON
( ReadShowJSON(..)
) where
--------------------------------------------------------------------------------
import Xanthous.Prelude
--------------------------------------------------------------------------------
import Data.Aeson
--------------------------------------------------------------------------------
newtype ReadShowJSON a = ReadShowJSON a
deriving newtype (Read, Show)
instance Show a => ToJSON (ReadShowJSON a) where
toJSON = toJSON . show
instance Read a => FromJSON (ReadShowJSON a) where
parseJSON = withText "readable"
$ maybe (fail "Could not read") pure . readMay